Override equals and hashCode methods

Author: LucaScorpion

src/main/java/com/scorpiac/javarant/Comment.java

@@ -17,4 +17,14 @@ static Comment fromJson(JsonObject json) {
                 Image.fromJson(json.get("attached_image"))
         );
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof Comment && ((Comment) obj).getId() == getId();
+    }
+
+    @Override
+    public int hashCode() {
+        return getId();
+    }
 }

src/main/java/com/scorpiac/javarant/Image.java

@@ -28,6 +28,16 @@ static Image fromJson(JsonElement json) {
         return new Image(obj.get("url").getAsString(), obj.get("width").getAsInt(), obj.get("height").getAsInt());
     }
 
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof Image && ((Image) obj).getUrl().equals(url);
+    }
+
+    @Override
+    public int hashCode() {
+        return url.hashCode();
+    }
+
     /**
      * Get the image url.
      *

src/main/java/com/scorpiac/javarant/Rant.java

@@ -111,6 +111,16 @@ public String link() {
         return DevRant.link(DevRant.RANT_URL + "/" + getId());
     }
 
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof Rant && ((Rant) obj).getId() == getId();
+    }
+
+    @Override
+    public int hashCode() {
+        return getId();
+    }
+
     /**
      * Get the tags from this rant.
      */

src/main/java/com/scorpiac/javarant/User.java

@@ -176,6 +176,16 @@ public String avatarLink() {
         return DevRant.AVATARS_URL + "/" + avatar;
     }
 
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof User && ((User) obj).getId() == id;
+    }
+
+    @Override
+    public int hashCode() {
+        return id;
+    }
+
     /**
      * Get the user id.
      */